Construction and installation of hexagonal wooden cages for fish farming: A technical manual

FAO Fisheries and Aquaculture Technical Paper No. 576

Construction and installation of hexagonal wooden cages for fish farming
A technical manual




Fabrizio Piccolotti
FAO Consultant
Rome, Italy

and

Alessandro Lovatelli
Aquaculture Officer
Aquaculture Branch
FAO Fisheries and Aquaculture Department
Rome, Italy



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Food and Agriculture Organization of the United Nations
Rome, 2013


ABSTRACT

Piccolotti, F. & Lovatelli, A. 2013.
Construction and installation of hexagonal wooden cages for fish farming: A technical manual
FAO Fisheries and Aquaculture Technical Paper. No. 576. Rome, FAO. 76 pp.

This document is a practical guide that provides a list and technical details of the materials to be used for constructing a hexagonal wooden cage, together with its mooring system, for fish farming within the framework of artisanal aquaculture. The instructions for assembling the different components are illustrated in detail, and the technical guidelines for cage installation at the farming site are also described. The basic knowledge and instructions provided in this manual are intended for those working in aquaculture development.


CONTENTS

Preparation of this document
Abstract
Acknowledgements
Glossary


1 –


Introduction

2 –

Selection of site and suitable species

 

2.1

Site selection

   

Environmental aspects

   

Hydrodynamic and geological factors

   

Physicochemical, ecological and biological factors

   

Logistical and sociocultural factors

 

2.2

Selection of suitable species

   

Economic aspects

   

Physiological aspects

   

Technical aspects

3 –

Choice of cage model

 

3.1

Basic criteria

   

Economic factors: cost and benefit analysis

   

Technical factors

4–

Components of a hexagonal wooden cage

 

4.1

Cage model

   

The frame

   

The flotation system

   

The mooring system

   

The net

5–

Cage construction

 

5.1

Preparation of the mooring posts

 

5.2

Fixing of the wooden structure

 

5.3

Preparation of the flotation system

6–

Cage installation at the farming site

 

6.1

Marking of mooring points

 

6.2

Preparation of mooring lines

 

6.3

Installation of mooring posts and mooring of the cage

 

6.4

Attachment of the net

References and suggested reading

Appendixes

 

1

Calculation of the surface area, volume and buoyancy of a body

 

2

Knots

 

3

Composition of concrete

 

4

Technical characteristics of ropes

 

5

Calculation of location of the mooring posts


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